The style and size of the keyboard cover really depend on the personality, person, and type of work done.
Some people find it more comfortable to hear typing clicks than other people do; some keyboards are noisy while others are quieter depending on their design; some persons need not be distracted by an obtrusive glare from outside that shines into the eyes while they need to use a keyboard. If you think you might benefit from a physical keyboard cover and if so which one would best suit your needs, we advise consulting with professional advice for this.